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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0cbbce55cf7feae11f25f28ce75d6fb03aec5a2ee23b3b60d97b18cbecd7a5' 
  AND token = 'iEMGMJYbmlgZgS8dkz4lZcTIKUUIzODka2/wSQGMsZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}